Oem bios mod and disk cloning info

i was just wondering ....
i have a dozen win xp vlk machines ...and i use noton ghost for cloning (i install one machine ...updates...applications and then ghost to other machines). with windows corporate i dont have any problem ..but i have a doubt that with the oem bios mod ..and the oem certificate ...which activates vista as an oem machine ...i won't be able to just clone the rest of my machines with the same image. the machines have all the same hardware specs ...so can anyone tell me if cloning will work?